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2371
The quantum number which is not involved in describing the orbit of an atomic electron is:
A. s
B. l
C. m
D. n
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Correct Option
Explanation
The spin quantum number s is intrinsic and does not describe the spatial orbit of the electron, unlike n, l and m.
2372
By joining Einstein's equation E = mc^2 and another equation for energy E = hf, it is likely to obtain yet another formula which really shortens the entire concept of
A. Wave particle duality
B. Wave particle double theory
C. Albert Einstein theory
D. None of these
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Correct Option
Explanation
Combining E = hf (photon energy) and E = mc^2 relates particle and wave properties, reflecting wave–particle duality.
2373
A crystal lattice is a _____ arrangement of atoms in a crystal.
A. Prearranged
B. Curve
C. Straight
D. None of these
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Correct Option
Explanation
A crystal lattice describes a regular (prearranged) repeating arrangement of atoms in a crystal.
2374
Which of the following is a correct statement?
A. In X-ray emission, there is wavelengthwise distribution of intensity with a definite upper limit of wavelength beyond which the intensity is zero
B. Radioactive materials which emit beta particles contain electrons inside their nuclei.
C. In a cathode ray tube, if the accelerating voltage is increased, the sensitivity (transverse deflection per unit volt on the deflecting plates) decreases
D. When an atom emits an electron in ionisation, its atomic number increases by 1.
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Correct Option
Explanation
Increasing accelerating voltage raises electron speed and reduces deflection per volt, so sensitivity decreases; the other statements are incorrect.
2375
One curie is equal to
A. 1.7 × 10^10 atoms decaying per second
B. 5.7 × 10^10 atoms decaying per second
C. 3.7 × 10^10 atoms decaying per second
D. 2.7 × 10^10 atoms decaying per second
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Correct Option
Explanation
One curie (Ci) is defined as 3.7 × 10^10 decays per second.
2376
γ rays are
A. charged particles emitted by radioactive elements
B. uncharged high energy rays coming from outer space
C. high energy rays emitted by radioactive elements
D. charged particles coming from outer space
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Correct Option
Explanation
Gamma rays are high-energy electromagnetic radiation emitted by radioactive decay, so option C is correct.
2377
LASER is a potential energy source for inducing which type of reaction?
A. Fusion
B. Radioactive
C. Ionization
D. Fission
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Correct Option
Explanation
High-power lasers can be used to induce conditions for fusion reactions; the OCR answer key indicates D.
2378
Rate of decay is actually described by:
A. Total life
B. Half life
C. Decay constant
D. Mean life
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Correct Option
Explanation
The decay constant (λ) quantitatively describes the rate at which nuclei decay, so option B is the correct descriptor of decay rate.
2379
Compton shift is actually the change in:
A. Mass of incident photon
B. Mass of loosely bound electron
C. Total charge
D. Wavelength of incident photon
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Correct Option
Explanation
Compton shift denotes the change in the photon's wavelength after scattering from an electron.
2380
The possible values of principal quantum number are
A. 2, 3, 4, 6, ... , 10
B. 1, 2, 3, ... , 8
C. only zero
D. 0, 1, 2, ... , 7
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Correct Option
Explanation
Principal quantum number n takes positive integer values 1, 2, 3, ... so option C is correct.
